Weaving looms, particularly dobbies



April 5, 1955 H. H. sTAusLl WEAVING LOOMS, PARTICULARLY DOBBIES 3 Sheets-Sheet 1 Filed Oct. 15, 1953 A: n v

April 5, 1955 H. H. srAuBLl WEAVING LOOMS, PARTICULARLY nossnss 3 Sheets-Sheet 2 Filed Oct. 15, 1953 WEAVING LOOMS, PARTICULARLY DO BBIES Filed Oct. 15, 1953 3 Sheets-Sheet 3 United States Patent WEAVING LOOMS, PARTICULARLY DOBBIES Heinrich Hugo Stiiubli, Horgen, Switzerland, Gebr. Stiiubli & Co., Horgen, Zurich, Swiss company assignor to Switzerland, a

A tendency exists in weaving to increase the speed of the looms, this also being the case with dobbies. However, a limit is set to the speed of these latter owing to the fact that the draw hooks drop on to the draw knives in free manner. The object aimed at in the present invention is to provide means for attaching the draw hooks positively to the draw knives or for removing them in positive manner from the latter. This enables the free drop method to be dispensed with and so allows the speed of the machine to be increased. To achieve this purpose an auxiliary knife works in conjunction with those members controlling the hooks in correspondence with the pattern card so that the motion the draw books have to make for attachment to the draw knife or which they have to make in order to lift themselves away from the draw knife is imparted to them positively. The attachment of the draw hooks to the draw knives and the lifting away from them takes place at the instant the draw knives are in their original position and the hooks are released. At this instant, that is to say, in the middle of the stoppage of the knives in their original position all the hooks of the corresponding pair of knives are pressed on to one knife and then, in accordance with the pattern card those hooks which have to be attached to the other knife of the pair of knives are attached by means of elements associated with each hook while the other element which had pressed all the hooks on to the other knife moves away from the knife thus freeing the path for that group of hooks.

Two embodiments of the invention are illustrated in the accompanying drawing.

Fig. l is a side View of a double lift, positive dobby with one side frame of the machine removed.

Fig. 2 is a working diagram of the machine shown in Fig. 1.

Fig. 3 shows a diagrammatic representation of a doublelift dobby as a second embodiment.

Fig. 1 shows a vertical section through the machine. In this arrangement it will of course be undesrtood as a matter of course that the hooks and the parts working or associated with them are always arranged in series next to or behind one another as is usual in dobby machines.

The double-lift positive dobby machine illustrated in Fig. l is provided with a frame 1 at front and rear, only the rear one being shown in this case, the front one being omitted. The shaft 2 is mounted in these frames, and the rocking levers 3 are mounted on this shaft so that they are capable of rocking, these levers 3 being connected by means of pivots 4 and connecting rods 5 with the shaft-lifting levers, not shown in the drawings. The rocking levers 3 are connected by pins 6 to balance levers 7 which carry the double hooks 8 and 9 rockably mounted at both ends. The double hooks 8 work in conjunction with the upper pair of knives 10, 11 and the double hooks 9 work in conjunction with the lower pair of knives 12, 13. The double hooks are pressed in each case, at the instant the associated pair of knives has reached its original position, by means of a shaft 14 or 15, against the knives 13 or 11. The shafts 14 and 15 extend over the whole width of the machine between the frames, so that all the hooks are pressed in each case against the associated knife. The shaft 14 is fixed in a pair of levers 16 and the shaft 15 in a pair of levers 17 between the frames of the machine. The levers 16 are mounted so as to be capable of rocking on a fixed shaft 18, while the levers 17 are rockably mounted on a fixed shaft 19.

2,705,505 Patented Apr. 5, 1955 Each of the levers 16 and 17 is provided with a roller 20 and 21. These rollers run on cams 22, one of these being mounted at each side of the machine on a cam shaft 23. The levers 16 and 17 are pressed against the cam 22 by means of a tension spring 24 and have a to and fro movement imparted to them by the cam. The double hooks 8 and 9 are provided at their ends which are pressed against the knives 10 or 12 with pressure faces 25 and 26. The levers 27 and 28 act on these faces at the moment when the associated knives 10 and 12 have reached their original position. The levers 27 are mounted in such a way that they can rotate on the shaft 29 and are provided with a pressure surface 30. The levers 28 are mounted so that they can rock on the shaft 31 and are provided with a pressure surface 32. The spring 33 rotates the lever 27 in a clockwise direction until the face 30 comes against the stop 35. The spring 34 rotates the lever 28 in a counterclockwise direction until its face 32 comes against the stop 36. The fixed stops 35 and 36 are provided with recesses 37 and 38 for guiding the front needles 39 and 40 or 41 so that these are able to act on the faces 30 and 32. The front needles 39 and 40 carry the reading needles 42 and 44 while the front needles 41 carry the reading needles 43. The front needles 39 and 40 can be actuated by the driving bar 45 and the front needles 41 by the driving bar 46, these driving bars executing a horizontal to and fro motion. Fig. 1 shows these driving bars 45 and 46 in their outermost position to the left. The driving bar 45 is provided with a racklike attached bar 45 and is supported by means of a roller 47 at each side of the machine and is rigidly connected to a lever 49 by means of a rod 48. The driving bar 46 carries the attached bar 46 and is supported by similarly arranged rollers 50 and is connected with the lever 52 by the rod 51. The levers 49 and 52 are in the form of double-arm levers and are mounted so that they can rock on a shaft 53 mounted on the frame of the machine. The lever 49 is provided at its lower end with a roller 54. The roller 54 runs on a cam 55 fixed on the shaft 56 and moves the driving bar 45 to and fro perpendicular to the plane of the drawing. The lever 52 is also in the form of a double-armed lever and is also provided at its lower end with a roller 57 which runs on a cam 58. Both levers 49 and 52 are pressed by means of springs 59 at their lower ends, that is, with their rollers against their cams. The cams 55 impart a to and fro motion to the driving bar 45 by means of the levers 49. The cam 58 also imparts a to and fro motion to the driving bar 46 by means of the roller 57 and the lever 52. The front needles 39 and 40 work in conjunction with the driving bar 45. The front needles 41 work in conjunction with the driving bar 46. The front needles 39 and 40 are supported by a rod 59 while the front needles 41 are supported by a rod 60. These rods extend over the entire width of the machine and are mounted at each end in a lever 61. By means of the rods 59 and 60 the front needles 39, 40 and 41 from which the reading needles 42 and 44 and 43 hang loosely are raised in each case by known means in order to effect the cylinder motion. The shaft 62 carrying a cylinder 63 over which the pattern card 64 is guided is mounted in the machine frame.

Referring to the diagram shown in Fig. 2, the working of the arrangement described is as follows:

In this diagram, the curves A indicate the motion of the knives 10 and 11; the curves B, the motion of the knives 12 and 13; the curve C, the needle lifting; curve D, the cylinder motion; curve E, the pressing-away motion of the lower hook 9 from the knife 12 by the rod 14; the curve F, the pressing-away motion of the hook 8 from the knife 10 by the rod 15; the curve G, the motion of the driving bar 46 for lifting the lower hook 9 from the knife 13 through the lever 28; the curve H, the lifting of the upper hook 8 from the knife 11 through the lever 27, and the curve I, finally, the lateral motion of the driving bar 45 with the rack-like attached bar 45'.

The position of the machine as illustrated in Fig. 1, corresponds to the instant in the diagram shown in Fig. 2. At this instant, the shaft 14 (curve B) is in its lowest position and it has from the moment when the lower knives (curve B) have returned to their initial position (at 50) commenced its motion and has pressed all the hooks 9 onto the knife 13. The hooks 9 are held by the spring 65 in their initial position on the knife. As the machine continues running, the shaft 14 returns at 130 again into its initial position which it reaches at 190. At 160 the driving bar 46 (curve G) begins its motion and presses those front needles which have dropped on to the driving bar 46 to the right and the hooks 9 corresponding to these dropped front needles on to the knife 12 so that at 190 the hooks can be taken along by the knives 12 or 13. The process is similar in the case of the top pair of knives (curve A) and the hooks 8. this starting at 300. The analogous motions of the shaft 15 (curve F) and of levers 27 and of front needles 39 and 40 and driving bar (curve J) can be seen from the diagram of Fig. 2.

Fig, 3 shows in diagrammatic manner an embodiment of the device applied to an ordinary double lift dobby.

in this case, the hooks and 66 work in conjunction with the knives 67 and 68, these hooks being mounted so that they can rock on the balance lever 69 and being provided wtih extensions 65 and 66 respectively. The positive application of the hooks 65 and 66 to the knives 67 and 68 is effected by means of the rods 70' and 71, these latter acting in conjunction with the lift bars 72 and 73 (in a manner not shown) so that the rods 70 and 71 are moved out of the way to provide a free path for the extensions 65' and 66' when the hooks 65 and 66 are lifted to inoperative position.

The pattern on the pattern cylinder 74 controls the reading needles 75, 76 and 77, these moving the front 4 needles 78, 79 and 80 at the moment the lift bars 72 and 73 are beginning their upward motion in such a manner that the rods 81, 82 and 83 pass in accordance with the pattern into or out of the range of the lift bars 72 and 73 during the motion of the driving bars 84 and 85.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim is:

In a loom, a plurality of movable draw knives, draw hooks engageable with said draw knives for actuation of said hooks, pattern mechanism controlled by a pattern card and selectively controlling the engagement of said hooks with said draw knives and means for effecting the positive movement of the draw hooks by the draw knives in accordance with a pattern card, comprising means for attaching all the draw hooks positively to the associated draw knife while the draw knives are passing through their dead path, and means for positively attaching certain draw hooks to their associated draw knives and for positively detaching them therefrom before and after the middle of the interval of time during which the draw knives are passing their their dead path, in accordance with the pattern card, the said means for positively attaching and detaching the said draw hooks working together in respect of time in such a way that the hooks for such positive attaching and detaching are guided positively.

References Cited in the file of this patent UNITED STATES PATENTS 2,071,784 Edwards Feb. 23, 1937 

